We are pleased to announce the fourth International PIAAC Research Conference 2025, funded by the German Federal Ministry of Education and Research. The conference will serve as a platform for sharing and discussing interdisciplinary research based on the Programme for the International Assessment of Adult Competencies (PIAAC). The focus of the conference will be on research based on data from the second PIAAC cycle (PIAAC 2023), to be released in December 2024.